Sheet doubler



Nov. 17 1925 w. M. CROWTHER SHEET DOUBLER Patented Nov. 17, 1925.

UNITED STATES WALTER M. caow'rnna, OFYMIDDLETOWN, omo.

SHEET DOUBLER. E L

Application filed August 27, 1924. Serial No. 734,515.

To all whom it may concern:

Be it known that I, WALTER M. CROW- rnna, a citizen of the United States, and a resident of Middletown, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in Sheet Doublers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification. I

My invention relates to machines for doubling metal sheets as part of the rolling process. I

It is my object to provide a device which will fold over one half of a metal sheet upon the other and then roll the doubled flat piece. In the WVelsh system of rolling sheets, it is often the practice when rolling has been made as far as possible on a single thickness piece to pile two or more pieces together, or

to double the single piece, so as to provide a thicker piece of metal for operation by the rolls.

At present the doubling is done by several men using tongs and hammers which results in a labor. cost that is avoided by myinvention.

In providing a mechanical doubler, it is necessary to provide a quick operation, and to take various sizes of pieces and fold them as exactly as possible into a single fold along their median line. My machine is designed to accomplish these features, and is simple to operate, and of few arts.

I accomplish my ob ects by that, certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed.

In the drawing:

Figure 1 is a top plan view of the doubler.

Figure 2 is a side elevation thereof.

I provide a pair of housings 1, 1, in which are mounted the pinch rolls 2 and 3. The lower roll is driven by a gear 4, which is caused to rotate by a pinion 5 on the shaft of a motor 6. The two rolls are geared together at 4.

Secured across between the housings is an angle bar 7 on which are mounted a series of interspaced looped guide plates 8. The lower ends of these plates are secured on the angle bar just below the line of delivery of the pinch rolls, and the plates thence extend away from the rolls, through an ample re turn bend and back down again to a oint iust above the line of delivery of the to s.

10 which have curved inner faces 11, facing the pinch rolls, same being of greater radius than the plates 8. I,

The mounting blocks or journal blocks for the rock shaft, indicated at 12, may be 10- cated in desired position with relation to the pinch rolls and secured by suitable bolts 13 to the machine base or mill floor.

The motor is a reversible motor so that the pinch rolls will revolve in either direction dependent upon the throwing of the switch that closes the motor circuit.

In operation a piece of sheet metal to be doubled is presented to the pinch rolls, which feed the piece in along the bottom of the interspaced guide plates, until the piece strikes the curve, whereupon the entire piece will be bent back on itself and its advancing edges will be turned back onto the incoming portions.

The result will be that the sheet will be fed in through the pinch rolls until the entire sheet has passed in, whereupon the rolls may be stopped. The operator then pulls over the rock shaft, and since the arms there are staggered with relation to the guide plates, the curved faces of the arms will engage the curved back of the piece of sheet metal and push it toward the rolls. The formed edge of the piece will thus be pressed forward until its edge strikes the pinch rolls, which act as a stop for both edges. The motor is then reversed and the rock shaft andarms used to push the doubled piece into the rolls, which will feed the doubled piece out, incidentally flattening it, and pressing a line of fold crosswise of the piece.

Within all usual limits of rolling mill practice, my doubler will take care of any pieces to be doubled, and the whole operation takes but little time, and a single man can handle it, saving both in labor cost and assuring against excessive loss of heat in the doubled piece.

When the sheet is too short for the loop lates, the arms 10 may be rocked forward into the spaces between the loops as the sheets come in, to assure proper bending.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a metal doubler, the combination with reversible feeding rollers, guiding means bent in a reverse curve so asto receive a piece from between the feeding rollers and to form it into a loop, and a movable member adapted to engage the looped piece and move-it to a position with the bent ends of the piece between the said feeding rollers.

2. In a metal doubler, the combination with feed rolls, of a reversing drive for the rolls, a looped guide disposed in position to receive a piece from between the rolls, and to guide said piece into the shape of a loop, and means to move the looped piece to a position with the ends thereof between the feed rolls.

3; In a metal doubler, the combination of a pair of feed rolls, means -for reversibly driving the rolls, a series of interspaced looped guides, positioned to receive metal from the feed rolls, a series of ejector arms located between the looped guides, and means for moving the ejector arms to position of forcing the edges of a looped piece against the feed rolls, for the purpose described.

4. In a metal doubler, the combination of apair of feed rolls means for reversibly driving the rolls, a series of interspaced looped guides, positioned to receive metal from the feed rolls, a series of e ector arms located between the looped guides, and means for moving the ejector arms to position of forcing the edges of a looped piece against the feed rolls, said arms being formed with curved faces toward the feed rolls, for the purpose described.

5. In a metal doubler, the combination of a pair of feed rolls, means for reversibly driving the'rolls, a series of interspaced looped guides, positioned to receive metal from the feed rolls, a series of ejector arms located between the looped guides, and means for moving the ejector arms to position of forcing the edges of a looped piece against the feed rolls, said arms being formed with curved faces toward the feed rolls, and a rock shaft on which the arms are mounted, and means for rocking the rock shaft.

6. In combination for the purpose described, a pair of feed rolls, means located at one side of the rolls for receiving a piece of metal fed thereby and imparting a looped shape thereto under impulse of the feed, and means for moving the piece so looped so as to bring its edges against the feed rolls, and means for driving the said rolls in forward direction to feed the piece to the first named means, and for reversely driving the rolls to feed out the piece.

WALTER M. OROl/VTH-ER. 

